I have a Linksys Wireless-N 400 dual-band. In and of itself it was the ********* router ever along with all the other crappy Linksys routers I've owned.

Then I installed DD-WRT on it and that thing is rock friggen solid now. It's amazing to login and see up-times pushing 90 days. With the default firmware I had constant reboots, and conflicting ip addresses on the network. DD-WRT FTW.